OK. Here's what I did. I reloaded the 'Install Shop IOS51', said 'no' to installing IOS51 (as I'd already done it) and said 'yes' to installing the shop channel. Everything seems to work ok! I'm not saying you should do it, but it seems to be fine on mine.

The first time I ran it a couple of weeks ago, I answered yes, yes, no (to shop channel). When I decided to run it again about an hour ago I answered no to installing IOS51, and then yes to the shop channel (there was no second question - just the IOS51 question and the shop channel question).